Adds BSD sysdep.
Adds support for MAKE variable, overriding make command in our build
scripts.
Fixes more files not ending with newline.
This was SVN commit r10994.
Support cancelling loads while inside a loader callback.
Fix use of ArchiveReader/Writer since their API changed.
Improve error-detection in deserializer to avoid crashes.
Report deserializer errors to users.
Expand load-error message box to fit message about invalid saved games.
This was SVN commit r10787.